1 May 1996 Spectroscopic data on 2-um laser systems
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Some of our recent spectral and energy transfer results on Tm3+-based 2-?m solid state laser systems are presented. Based on experimental data, with an improved algorithm and parameterized crystal field calculations, complete energy level diagrams for Tm3+ in YAG and GGG are obtained. The sets of crystal field parameters could be used to estimate a series of important spectral data for laser emission. A discussion of the spectral characteristics and the nature of Tm3+ multisite structure is also presented. The static spectral modifications in Cr3+ codoped with Tm3+ YAG or GGG crystals, due to mutual crystal field perturbations of the two dopants, are connected with Cr3+-Tm3+ pairs. The high-resolution data offer direct evidence that the Cr31-Tm3+ energy transfer is governed for near neighbor Cr3+(a)-Tm3+(c) pairs by a shortrange, most probably superexchange, interaction. The contribution of multipolar interactions should be considered only for more distant pairs, while at large distances, dipole-dipole interaction is dominant. The data suggest that the sensitization with Cr3+ determines not only an efficient way of transfer of excitation from the pumping sources to active ions but could produce changes of the spectal and temporal behavior of the latter.
Aurelia Lupei, Aurelia Lupei, Voicu Lupei, Voicu Lupei, Carmen Tiseanu, Carmen Tiseanu, "Spectroscopic data on 2-um laser systems," Optical Engineering 35(5), (1 May 1996). https://doi.org/10.1117/1.601022 . Submission:

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